flaviogheri/nlp_course

YSDA course in Natural Language Processing

YSDA Natural Language Processing course

• This is the 2023 version. For previous year' course materials, go to this branch
• Lecture and seminar materials for each week are in ./week* folders, see README.md for materials and instructions
• Any technical issues, ideas, bugs in course materials, contribution ideas - add an issue
• Installing libraries and troubleshooting: this thread.

Syllabus

• week01 Word Embeddings

  • Lecture: Word embeddings. Distributional semantics. Count-based (pre-neural) methods. Word2Vec: learn vectors. GloVe: count, then learn. Evaluation: intrinsic vs extrinsic. Analysis and Interpretability. Interactive lecture materials and more.
  • Seminar: Playing with word and sentence embeddings
  • Homework: Embedding-based machine translation system

• week02 Text Classification

  • Lecture: Text classification: introduction and datasets. General framework: feature extractor + classifier. Classical approaches: Naive Bayes, MaxEnt (Logistic Regression), SVM. Neural Networks: General View, Convolutional Models, Recurrent Models. Practical Tips: Data Augmentation. Analysis and Interpretability. Interactive lecture materials and more.
  • Seminar: Text classification with convolutional NNs.
  • Homework: Statistical & neural text classification.

• week03 Language Modeling

  • Lecture: Language Modeling: what does it mean? Left-to-right framework. N-gram language models. Neural Language Models: General View, Recurrent Models, Convolutional Models. Evaluation. Practical Tips: Weight Tying. Analysis and Interpretability. Interactive lecture materials and more.
  • Seminar: Build a N-gram language model from scratch
  • Homework: Neural LMs & smoothing in count-based models.

• week04 Seq2seq and Attention

  • Lecture: Seq2seq Basics: Encoder-Decoder framework, Training, Simple Models, Inference (e.g., beam search). Attention: general, score functions, models. Transformer: self-attention, masked self-attention, multi-head attention; model architecture. Subword Segmentation (BPE). Analysis and Interpretability: functions of attention heads; probing for linguistic structure. Interactive lecture materials and more.
  • Seminar: Basic sequence to sequence model
  • Homework: Machine translation with attention

• week05 Transfer Learning

  • Lecture: What is Transfer Learning? Great idea 1: From Words to Words-in-Context (CoVe, ELMo). Great idea 2: From Replacing Embeddings to Replacing Models (GPT, BERT). (A Bit of) Adaptors. Analysis and Interpretability. Interactive lecture materials and more.
  • Homework: fine-tuning a pre-trained BERT model

• week06 LLMs and Prompting

  • Lecture: Scaling laws. Emergent abilities. Prompting (aka "in-context learning"): techiques that work; questioning whether model "understands" prompts. Hypotheses for why and how in-context learning works. Analysis and Interpretability.
  • Homework: manual prompt engneering and chain-of-thought reasoning

• [week07] Transformer architecture and training

  • Lecture: training tips for transformers; the evolution of transformer architecture from Vaswani et al (2017) to modern LLMs; parameter-efficient fine-tuning (PEFT)
  • Homework: fine-tuning a large language model with PEFT algorithms

More TBA

Contributors & course staff

Course materials and teaching performed by

• Elena Voita - course admin, lectures, seminars, homeworks
• Valentina Broner - course admin for on-campus students
• Boris Kovarsky, David Talbot, Sergey Gubanov, Just Heuristic - help build course materials and/or held some classes
• 30+ volunteers who contributed and refined the notebooks and course materials. Without their help, the course would not be what it is today
• A mighty host of TAs who stoically grade hundreds of homework submissions from on-campus students each year